decompress_bunzip2: off by one in get_next_block()
"origPtr" is used as an offset into the bd->dbuf[] array. That array is
allocated in start_bunzip() and has "bd->dbufSize" number of elements so
the test here should be >= instead of >.
Later we check "origPtr" again before using it as an offset so I don't
know if this bug can be triggered in real life.
Fixes: bc22c17e12
('bzip2/lzma: library support for gzip, bzip2 and lzma decompression')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -184,7 +184,7 @@ static int INIT get_next_block(struct bunzip_data *bd)
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if (get_bits(bd, 1))
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return RETVAL_OBSOLETE_INPUT;
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origPtr = get_bits(bd, 24);
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if (origPtr > dbufSize)
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if (origPtr >= dbufSize)
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return RETVAL_DATA_ERROR;
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/* mapping table: if some byte values are never used (encoding things
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like ascii text), the compression code removes the gaps to have fewer
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